Speaker unit
US6493452B1 · kind B1 · utility
14Cited by
11References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 18, 1999 |
| Grant date | Dec 10, 2002 |
| Priority date | — |
| Expiry date | May 18, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R1/24
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A speaker unit includes a woofer having a diaphragm with an ellipse shape sound emitting opening, and a separate speaker having an ellipse shape diaphragm with an area smaller than that of the diaphragm of the woofer, located in front of the diaphragm of the woofer, attached to a center axis of the ellipse shape of the woofer coincident with that of the ellipse shape of the separate speaker, and emitting a sound higher in frequency than that of the woofer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.